Field Patents Restoration Projects
By Gerry Stoneman
from issue No 19

Some two and a half years ago in a weird and wonderful deal I became the custodian of a grand collection of artefacts and motorcycle parts etc…

In this collection where original drawings, sketches and all wooden casting patterns for Field Number 1 and Field Number 2 engines and related parts including two original boilers and burners.

At this instance we will deal with machines number 1 and 2, using number 1 engine.

Dimensions 45mm Bore, 50mm Stroke. It is of the high pressure variable expansion variety, developing 8HP, with popet valves and a 180º crank shaft. The inlet opening valve from 0-75%. The machine will go practically anywhere on a 13% cut off.

The engine has cast iron pistons, Babbit metal big end and bronze main bearings. Variable lift sliding camshaft operated from top of tank.

PS. The oil has been sent back to Morris Oils for recycling!

After stripping and giving the project our diligent perusal and a complete wash and brush up here is the engine parts below:

There are only two timing wheels therefore the engine is almost identical with the ordinary motorcycle power unit.

The only adjustments made where re-fitting of the big end bearings and replacement of valve springs, all other components are absolutely as constructed by Mr Field in 1908

To the left is original wooden pattern for top crank case half engine number 1. and below is complete one-piece cylinder block inlet, exhaust ports and valve stem guides cast with permanent cylinder head, all designed to be machined from one casting.

The original name plate